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source: mod_gnutls/src/gnutls_hooks.c @ 8273683

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Last change on this file since 8273683 was 8273683, checked in by Fiona Klute <fiona.klute@…>, 2 years ago
Fix port numbers for vhosts in post_config log messages
Property mode set to `100644`
File size: 78.2 KB

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1	/*
2	* Copyright 2004-2005 Paul Querna
3	* Copyright 2008, 2014 Nikos Mavrogiannopoulos
4	* Copyright 2011 Dash Shendy
5	* Copyright 2013-2014 Daniel Kahn Gillmor
6	* Copyright 2015-2018 Fiona Klute
7	*
8	* Licensed under the Apache License, Version 2.0 (the "License");
9	* you may not use this file except in compliance with the License.
10	* You may obtain a copy of the License at
11	*
12	* http://www.apache.org/licenses/LICENSE-2.0
13	*
14	* Unless required by applicable law or agreed to in writing, software
15	* distributed under the License is distributed on an "AS IS" BASIS,
16	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17	* See the License for the specific language governing permissions and
18	* limitations under the License.
19	*/
20
21	#include "mod_gnutls.h"
22	#include "gnutls_cache.h"
23	#include "gnutls_config.h"
24	#include "gnutls_ocsp.h"
25	#include "gnutls_util.h"
26	#include "gnutls_watchdog.h"
27
28	#include "http_vhost.h"
29	#include "ap_mpm.h"
30	#include "mod_status.h"
31	#include <util_mutex.h>
32	#include <apr_escape.h>
33
34	#ifdef ENABLE_MSVA
35	#include <msv/msv.h>
36	#endif
37
38	#ifdef APLOG_USE_MODULE
39	APLOG_USE_MODULE(gnutls);
40	#endif
41
42	#if MOD_GNUTLS_DEBUG
43	static apr_file_t *debug_log_fp;
44	#endif
45
46	#define IS_PROXY_STR(c) \
47	((c->is_proxy == GNUTLS_ENABLED_TRUE) ? "proxy " : "")
48
49	/** Key to encrypt session tickets. Must be kept secret. This key is
50	* generated in the `pre_config` hook and thus constant across
51	* forks. The problem with this approach is that it does not support
52	* regular key rotation. */
53	static gnutls_datum_t session_ticket_key = {NULL, 0};
54
55
56	/** Default GnuTLS priority string for mod_gnutls */
57	#define MGS_DEFAULT_PRIORITY "NORMAL"
58	/** Compiled version of MGS_DEFAULT_PRIORITY (initialized in the
59	* pre_config hook) */
60	static gnutls_priority_t default_prio;
61
62
63	static int mgs_cert_verify(request_rec * r, mgs_handle_t * ctxt);
64	/* use side==0 for server and side==1 for client */
65	static void mgs_add_common_cert_vars(request_rec * r, gnutls_x509_crt_t cert, int side, size_t export_cert_size);
66	static int mgs_status_hook(request_rec *r, int flags);
67	#ifdef ENABLE_MSVA
68	static const char* mgs_x509_construct_uid(request_rec * pool, gnutls_x509_crt_t cert);
69	#endif
70	static int load_proxy_x509_credentials(apr_pool_t pconf, apr_pool_t ptemp, server_rec *s)
71	__attribute__((nonnull));
72
73	/* Pool Cleanup Function */
74	apr_status_t mgs_cleanup_pre_config(void *data __attribute__((unused)))
75	{
76	/* Free session ticket master key */
77	#if GNUTLS_VERSION_NUMBER >= 0x030400
78	gnutls_memset(session_ticket_key.data, 0, session_ticket_key.size);
79	#endif
80	gnutls_free(session_ticket_key.data);
81	session_ticket_key.data = NULL;
82	session_ticket_key.size = 0;
83
84	/* Deinit default priority setting */
85	gnutls_priority_deinit(default_prio);
86	return APR_SUCCESS;
87	}
88
89	/* Logging Function for Maintainers */
90	#if MOD_GNUTLS_DEBUG
91	static void gnutls_debug_log_all(int level, const char *str) {
92	apr_file_printf(debug_log_fp, "<%d> %s", level, str);
93	}
94	#define _gnutls_log apr_file_printf
95	#else
96	#define _gnutls_log(...)
97	#endif
98
99	static const char* mgs_readable_cvm(mgs_client_verification_method_e m) {
100	switch(m) {
101	case mgs_cvm_unset:
102	return "unset";
103	case mgs_cvm_cartel:
104	return "cartel";
105	case mgs_cvm_msva:
106	return "msva";
107	}
108	return "unknown";
109	}
110
111	/* Pre-Configuration HOOK: Runs First */
112	int mgs_hook_pre_config(apr_pool_t * pconf, apr_pool_t * plog, apr_pool_t * ptemp __attribute__((unused))) {
113
114	/* Maintainer Logging */
115	#if MOD_GNUTLS_DEBUG
116	apr_file_open(&debug_log_fp, "/tmp/gnutls_debug", APR_APPEND \| APR_WRITE \| APR_CREATE, APR_OS_DEFAULT, pconf);
117	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
118	gnutls_global_set_log_level(9);
119	gnutls_global_set_log_function(gnutls_debug_log_all);
120	_gnutls_log(debug_log_fp, "gnutls: %s\n", gnutls_check_version(NULL));
121	#endif
122
123	int ret;
124
125	/* Check for required GnuTLS Library Version */
126	if (gnutls_check_version(LIBGNUTLS_VERSION) == NULL) {
127	ap_log_perror(APLOG_MARK, APLOG_EMERG, 0, plog, "gnutls_check_version() failed. Required: "
128	"gnutls-%s Found: gnutls-%s", LIBGNUTLS_VERSION, gnutls_check_version(NULL));
129	return DONE;
130	}
131
132	/* Generate a Session Key */
133	ret = gnutls_session_ticket_key_generate(&session_ticket_key);
134	if (ret < 0) {
135	ap_log_perror(APLOG_MARK, APLOG_EMERG, 0, plog, "gnutls_session_ticket_key_generate: %s", gnutls_strerror(ret));
136	return DONE;
137	}
138
139	/* Initialize default priority setting */
140	ret = gnutls_priority_init(&default_prio, MGS_DEFAULT_PRIORITY, NULL);
141	if (ret < 0)
142	{
143	ap_log_perror(APLOG_MARK, APLOG_EMERG, 0, plog,
144	"gnutls_priority_init failed for default '%s': %s (%d)",
145	MGS_DEFAULT_PRIORITY, gnutls_strerror(ret), ret);
146	return DONE;
147	}
148
149	AP_OPTIONAL_HOOK(status_hook, mgs_status_hook, NULL, NULL, APR_HOOK_MIDDLE);
150
151	ap_mutex_register(pconf, MGS_CACHE_MUTEX_NAME, NULL, APR_LOCK_DEFAULT, 0);
152	ap_mutex_register(pconf, MGS_OCSP_MUTEX_NAME, NULL, APR_LOCK_DEFAULT, 0);
153	ap_mutex_register(pconf, MGS_OCSP_CACHE_MUTEX_NAME, NULL,
154	APR_LOCK_DEFAULT, 0);
155
156	/* Register a pool clean-up function */
157	apr_pool_cleanup_register(pconf, NULL, mgs_cleanup_pre_config, apr_pool_cleanup_null);
158
159	return OK;
160	}
161
162
163
164	/**
165	* Get the list of available protocols for this connection and add it
166	* to the GnuTLS session. Must run before the client hello function.
167	*/
168	static void prepare_alpn_proposals(mgs_handle_t *ctxt)
169	{
170	/* Check if any protocol upgrades are available
171	*
172	* The "report_all" parameter to ap_get_protocol_upgrades() is 0
173	* (report only more preferable protocols) because setting it to 1
174	* doesn't actually report ALL protocols, but only all except the
175	* current one. This way we can at least list the current one as
176	* available by appending it without potentially negotiating a
177	* less preferred protocol. */
178	const apr_array_header_t *pupgrades = NULL;
179	apr_status_t ret =
180	ap_get_protocol_upgrades(ctxt->c, NULL, ctxt->c->base_server,
181	/report_all/ 0, &pupgrades);
182	if (ret != APR_SUCCESS)
183	{
184	ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, ctxt->c,
185	"%s: ap_get_protocol_upgrades() failed, "
186	"cannot configure ALPN!", __func__);
187	return;
188	}
189
190	if (pupgrades == NULL \|\| pupgrades->nelts == 0)
191	{
192	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, ctxt->c,
193	"%s: No protocol upgrades available.", __func__);
194	return;
195	}
196
197	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, ctxt->c,
198	"%s: Found %d protocol upgrade(s) for ALPN: %s",
199	__func__, pupgrades->nelts,
200	apr_array_pstrcat(ctxt->c->pool, pupgrades, ','));
201	gnutls_datum_t *alpn_protos =
202	apr_palloc(ctxt->c->pool,
203	(pupgrades->nelts + 1) * sizeof(gnutls_datum_t));
204	for (int i = 0; i < pupgrades->nelts; i++)
205	{
206	alpn_protos[i].data = (void ) APR_ARRAY_IDX(pupgrades, i, char );
207	alpn_protos[i].size =
208	strnlen(APR_ARRAY_IDX(pupgrades, i, char *),
209	pupgrades->elt_size);
210	}
211
212	/* Add the current (default) protocol at the end of the list */
213	alpn_protos[pupgrades->nelts].data =
214	(void*) apr_pstrdup(ctxt->c->pool, ap_get_protocol(ctxt->c));
215	alpn_protos[pupgrades->nelts].size =
216	strlen((char*) alpn_protos[pupgrades->nelts].data);
217	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, ctxt->c,
218	"%s: Adding current protocol %s to ALPN set.",
219	__func__, alpn_protos[pupgrades->nelts].data);
220
221	gnutls_alpn_set_protocols(ctxt->session,
222	alpn_protos,
223	pupgrades->nelts,
224	GNUTLS_ALPN_SERVER_PRECEDENCE);
225	}
226
227
228
229	/**
230	* Check if ALPN selected any protocol upgrade, try to switch if so.
231	*/
232	static int process_alpn_result(mgs_handle_t *ctxt)
233	{
234	int ret = 0;
235	gnutls_datum_t alpn_proto;
236	ret = gnutls_alpn_get_selected_protocol(ctxt->session, &alpn_proto);
237	if (ret != GNUTLS_E_SUCCESS)
238	{
239	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
240	"%s: No ALPN result: %s (%d)",
241	__func__, gnutls_strerror(ret), ret);
242	return GNUTLS_E_SUCCESS;
243	}
244
245	apr_array_header_t *client_protos =
246	apr_array_make(ctxt->c->pool, 1, sizeof(char *));
247	/* apr_pstrndup to ensure that the protocol is null terminated */
248	APR_ARRAY_PUSH(client_protos, char *) =
249	apr_pstrndup(ctxt->c->pool, (char*) alpn_proto.data, alpn_proto.size);
250	const char *selected =
251	ap_select_protocol(ctxt->c, NULL, ctxt->c->base_server,
252	client_protos);
253
254	/* ap_select_protocol() will return NULL if none of the ALPN
255	* proposals matched. GnuTLS negotiated alpn_proto based on the
256	* list provided by the server, but the vhost might have changed
257	* based on SNI. Apache seems to adjust the proposal list to avoid
258	* such issues though.
259	*
260	* GnuTLS will return a fatal "no_application_protocol" alert as
261	* required by RFC 7301 if the post client hello function returns
262	* GNUTLS_E_NO_APPLICATION_PROTOCOL. */
263	if (!selected)
264	{
265	ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_EGENERAL, ctxt->c,
266	"%s: ap_select_protocol() returned NULL! Please "
267	"make sure any overlapping vhosts have the same "
268	"protocols available.",
269	__func__);
270	return GNUTLS_E_NO_APPLICATION_PROTOCOL;
271	}
272
273	if (strcmp(selected, ap_get_protocol(ctxt->c)) == 0)
274	{
275	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
276	"%s: Already using protocol '%s', nothing to do.",
277	__func__, selected);
278	return GNUTLS_E_SUCCESS;
279	}
280
281	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ctxt->c,
282	"%s: Switching protocol to '%s' based on ALPN.",
283	__func__, selected);
284	apr_status_t status = ap_switch_protocol(ctxt->c, NULL,
285	ctxt->c->base_server,
286	selected);
287	if (status != APR_SUCCESS)
288	{
289	ap_log_cerror(APLOG_MARK, APLOG_ERR, status, ctxt->c,
290	"%s: Protocol switch to '%s' failed!",
291	__func__, selected);
292	return GNUTLS_E_NO_APPLICATION_PROTOCOL;
293	}
294	/* ALPN done! */
295	return GNUTLS_E_SUCCESS;
296	}
297
298
299
300	/**
301	* Post client hello function for GnuTLS, used to configure the TLS
302	* server based on virtual host configuration. Uses SNI to select the
303	* virtual host if available.
304	*
305	* @param session the TLS session
306	*
307	* @return zero or a GnuTLS error code, as required by GnuTLS hook
308	* definition
309	*/
310	static int mgs_select_virtual_server_cb(gnutls_session_t session)
311	{
312	int ret = 0;
313	mgs_handle_t *ctxt = gnutls_session_get_ptr(session);
314
315	/* try to find a virtual host */
316	mgs_srvconf_rec *tsc = mgs_find_sni_server(session);
317	if (tsc != NULL)
318	{
319	/* Found a TLS vhost based on the SNI, configure the
320	* connection context. */
321	ctxt->sc = tsc;
322	}
323
324	gnutls_certificate_server_set_request(session, ctxt->sc->client_verify_mode);
325
326	/* Set x509 credentials */
327	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, ctxt->sc->certs);
328	/* Set Anon credentials */
329	gnutls_credentials_set(session, GNUTLS_CRD_ANON, ctxt->sc->anon_creds);
330
331	#ifdef ENABLE_SRP
332	/* Set SRP credentials */
333	if (ctxt->sc->srp_tpasswd_conf_file != NULL && ctxt->sc->srp_tpasswd_file != NULL) {
334	gnutls_credentials_set(session, GNUTLS_CRD_SRP, ctxt->sc->srp_creds);
335	}
336	#endif
337
338	/* Enable session tickets */
339	if (session_ticket_key.data != NULL &&
340	ctxt->sc->tickets == GNUTLS_ENABLED_TRUE)
341	{
342	ret = gnutls_session_ticket_enable_server(ctxt->session, &session_ticket_key);
343	if (ret != GNUTLS_E_SUCCESS)
344	ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_EGENERAL, ctxt->c,
345	"gnutls_session_ticket_enable_server failed: %s (%d)",
346	gnutls_strerror(ret), ret);
347	}
348
349	ret = process_alpn_result(ctxt);
350	if (ret != GNUTLS_E_SUCCESS)
351	return ret;
352
353	/* Update the priorities - to avoid negotiating a ciphersuite that is not
354	* enabled on this virtual server. Note that here we ignore the version
355	* negotiation. */
356	ret = gnutls_priority_set(session, ctxt->sc->priorities);
357
358	/* actually it shouldn't fail since we have checked at startup */
359	return ret;
360	}
361
362	static int cert_retrieve_fn(gnutls_session_t session,
363	const gnutls_datum_t * req_ca_rdn __attribute__((unused)),
364	int nreqs __attribute__((unused)),
365	const gnutls_pk_algorithm_t * pk_algos __attribute__((unused)),
366	int pk_algos_length __attribute__((unused)),
367	gnutls_pcert_st **pcerts,
368	unsigned int *pcert_length,
369	gnutls_privkey_t *privkey)
370	{
371	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
372
373	mgs_handle_t *ctxt;
374
375	if (session == NULL) {
376	// ERROR INVALID SESSION
377	return -1;
378	}
379
380	ctxt = gnutls_transport_get_ptr(session);
381
382	if (gnutls_certificate_type_get(session) == GNUTLS_CRT_X509) {
383	// X509 CERTIFICATE
384	*pcerts = ctxt->sc->certs_x509_chain;
385	*pcert_length = ctxt->sc->certs_x509_chain_num;
386	*privkey = ctxt->sc->privkey_x509;
387	return 0;
388	} else {
389	// UNKNOWN CERTIFICATE
390	return -1;
391	}
392	}
393
394
395
396	#if GNUTLS_VERSION_NUMBER >= 0x030506
397	#define HAVE_KNOWN_DH_GROUPS 1
398	#endif
399	#ifdef HAVE_KNOWN_DH_GROUPS
400	/**
401	* Try to estimate a GnuTLS security parameter based on the given
402	* private key. Any errors are logged.
403	*
404	* @param s The `server_rec` to use for logging
405	*
406	* @param key The private key to use
407	*
408	* @return `gnutls_sec_param_t` as returned by
409	* `gnutls_pk_bits_to_sec_param` for the key properties, or
410	* GNUTLS_SEC_PARAM_UNKNOWN in case of error
411	*/
412	static gnutls_sec_param_t sec_param_from_privkey(server_rec *server,
413	gnutls_privkey_t key)
414	{
415	unsigned int bits = 0;
416	int pk_algo = gnutls_privkey_get_pk_algorithm(key, &bits);
417	if (pk_algo < 0)
418	{
419	ap_log_error(APLOG_MARK, APLOG_ERR, APR_EGENERAL, server,
420	"%s: Could not get private key parameters: %s (%d)",
421	__func__, gnutls_strerror(pk_algo), pk_algo);
422	return GNUTLS_SEC_PARAM_UNKNOWN;
423	}
424	return gnutls_pk_bits_to_sec_param(pk_algo, bits);
425	}
426	#else
427	/** ffdhe2048 DH group as defined in RFC 7919, Appendix A.1. This is
428	* the default DH group if mod_gnutls is compiled agains a GnuTLS
429	* version that does not provide known DH groups based on security
430	* parameters (before 3.5.6). */
431	static const char FFDHE2048_PKCS3[] =
432	"-----BEGIN DH PARAMETERS-----\n"
433	"MIIBDAKCAQEA//////////+t+FRYortKmq/cViAnPTzx2LnFg84tNpWp4TZBFGQz\n"
434	"+8yTnc4kmz75fS/jY2MMddj2gbICrsRhetPfHtXV/WVhJDP1H18GbtCFY2VVPe0a\n"
435	"87VXE15/V8k1mE8McODmi3fipona8+/och3xWKE2rec1MKzKT0g6eXq8CrGCsyT7\n"
436	"YdEIqUuyyOP7uWrat2DX9GgdT0Kj3jlN9K5W7edjcrsZCwenyO4KbXCeAvzhzffi\n"
437	"7MA0BM0oNC9hkXL+nOmFg/+OTxIy7vKBg8P+OxtMb61zO7X8vC7CIAXFjvGDfRaD\n"
438	"ssbzSibBsu/6iGtCOGEoXJf//////////wIBAgICAQA=\n"
439	"-----END DH PARAMETERS-----\n";
440	const gnutls_datum_t default_dh_params = {
441	(void *) FFDHE2048_PKCS3,
442	sizeof(FFDHE2048_PKCS3)
443	};
444	#endif
445
446
447
448	/**
449	* Configure the default DH groups to use for the given server. When
450	* compiled against GnuTLS version 3.5.6 or newer the known DH group
451	* matching the GnuTLS security parameter estimated from the private
452	* key is used. Otherwise the ffdhe2048 DH group as defined in RFC
453	* 7919, Appendix A.1 is the default.
454	*
455	* @param server the host to configure
456	*
457	* @return `OK` on success, `HTTP_UNAUTHORIZED` otherwise
458	*/
459	static int set_default_dh_param(server_rec *server)
460	{
461	mgs_srvconf_rec sc = (mgs_srvconf_rec )
462	ap_get_module_config(server->module_config, &gnutls_module);
463
464	#ifdef HAVE_KNOWN_DH_GROUPS
465	gnutls_sec_param_t seclevel = GNUTLS_SEC_PARAM_UNKNOWN;
466	if (sc->privkey_x509)
467	{
468	seclevel = sec_param_from_privkey(server, sc->privkey_x509);
469	ap_log_error(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, server,
470	"%s: GnuTLS security param estimated based on "
471	"private key '%s': %s",
472	__func__, sc->x509_key_file,
473	gnutls_sec_param_get_name(seclevel));
474	}
475
476	if (seclevel == GNUTLS_SEC_PARAM_UNKNOWN)
477	seclevel = GNUTLS_SEC_PARAM_MEDIUM;
478	ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, server,
479	"%s: Setting DH params for security level '%s'.",
480	__func__, gnutls_sec_param_get_name(seclevel));
481
482	int ret = gnutls_certificate_set_known_dh_params(sc->certs, seclevel);
483	if (ret < 0)
484	{
485	ap_log_error(APLOG_MARK, APLOG_EMERG, APR_EGENERAL, server,
486	"%s: setting known DH params failed: %s (%d)",
487	__func__, gnutls_strerror(ret), ret);
488	return HTTP_UNAUTHORIZED;
489	}
490	ret = gnutls_anon_set_server_known_dh_params(sc->anon_creds, seclevel);
491	if (ret < 0)
492	{
493	ap_log_error(APLOG_MARK, APLOG_EMERG, APR_EGENERAL, server,
494	"%s: setting known DH params failed: %s (%d)",
495	__func__, gnutls_strerror(ret), ret);
496	return HTTP_UNAUTHORIZED;
497	}
498	#else
499	int ret = gnutls_dh_params_init(&sc->dh_params);
500	if (ret < 0)
501	{
502	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, server,
503	"%s: Failed to initialize DH params structure: "
504	"%s (%d)", __func__, gnutls_strerror(ret), ret);
505	return HTTP_UNAUTHORIZED;
506	}
507	ret = gnutls_dh_params_import_pkcs3(sc->dh_params, &default_dh_params,
508	GNUTLS_X509_FMT_PEM);
509	if (ret < 0)
510	{
511	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, server,
512	"%s: Failed to import default DH params: %s (%d)",
513	__func__, gnutls_strerror(ret), ret);
514	return HTTP_UNAUTHORIZED;
515	}
516
517	gnutls_certificate_set_dh_params(sc->certs, sc->dh_params);
518	gnutls_anon_set_server_dh_params(sc->anon_creds, sc->dh_params);
519	#endif
520
521	return OK;
522	}
523
524
525
526	/**
527	* Post config hook.
528	*
529	* Must return OK or DECLINED on success, something else on
530	* error. These codes are defined in Apache httpd.h along with the
531	* HTTP status codes, so I'm going to use HTTP error codes both for
532	* fun (and to avoid conflicts).
533	*/
534	int mgs_hook_post_config(apr_pool_t *pconf,
535	apr_pool_t *plog __attribute__((unused)),
536	apr_pool_t *ptemp,
537	server_rec *base_server)
538	{
539	int rv;
540	server_rec *s;
541	mgs_srvconf_rec *sc;
542	mgs_srvconf_rec *sc_base;
543	void *data = NULL;
544	const char *userdata_key = "mgs_init";
545
546	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
547
548	apr_pool_userdata_get(&data, userdata_key, base_server->process->pool);
549	if (data == NULL) {
550	apr_pool_userdata_set((const void *) 1, userdata_key, apr_pool_cleanup_null, base_server->process->pool);
551	}
552
553	s = base_server;
554	sc_base = (mgs_srvconf_rec *) ap_get_module_config(s->module_config, &gnutls_module);
555
556
557	rv = mgs_cache_post_config(pconf, ptemp, s, sc_base);
558	if (rv != APR_SUCCESS)
559	{
560	ap_log_error(APLOG_MARK, APLOG_STARTUP, rv, s,
561	"Post config for cache failed.");
562	return HTTP_INSUFFICIENT_STORAGE;
563	}
564
565	if (sc_base->ocsp_mutex == NULL)
566	{
567	rv = ap_global_mutex_create(&sc_base->ocsp_mutex, NULL,
568	MGS_OCSP_MUTEX_NAME, NULL,
569	base_server, pconf, 0);
570	if (rv != APR_SUCCESS)
571	return rv;
572	}
573
574	/* If GnuTLSP11Module is set, load the listed PKCS #11
575	* modules. Otherwise system defaults will be used. */
576	if (sc_base->p11_modules != NULL)
577	{
578	rv = gnutls_pkcs11_init(GNUTLS_PKCS11_FLAG_MANUAL, NULL);
579	if (rv < 0)
580	{
581	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
582	"GnuTLS: Initializing PKCS #11 "
583	"failed: %s (%d).",
584	gnutls_strerror(rv), rv);
585	}
586	else
587	{
588	for (int i = 0; i < sc_base->p11_modules->nelts; i++)
589	{
590	char *p11_module =
591	APR_ARRAY_IDX(sc_base->p11_modules, i, char *);
592	rv = gnutls_pkcs11_add_provider(p11_module, NULL);
593	if (rv != GNUTLS_E_SUCCESS)
594	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
595	"GnuTLS: Loading PKCS #11 provider module %s "
596	"failed: %s (%d).",
597	p11_module, gnutls_strerror(rv), rv);
598	}
599	}
600	}
601
602	sc_base->singleton_wd =
603	mgs_new_singleton_watchdog(base_server, MGS_SINGLETON_WATCHDOG, pconf);
604
605	for (s = base_server; s; s = s->next)
606	{
607	sc = (mgs_srvconf_rec *) ap_get_module_config(s->module_config, &gnutls_module);
608	sc->cache_enable = sc_base->cache_enable;
609	sc->cache = sc_base->cache;
610	if (sc->cache_timeout == MGS_TIMEOUT_UNSET)
611	sc->cache_timeout = sc_base->cache_timeout;
612	sc->ocsp_cache = sc_base->ocsp_cache;
613
614	sc->singleton_wd = sc_base->singleton_wd;
615
616	/* defaults for unset values: */
617	if (sc->enabled == GNUTLS_ENABLED_UNSET)
618	sc->enabled = GNUTLS_ENABLED_FALSE;
619	if (sc->tickets == GNUTLS_ENABLED_UNSET)
620	{
621	/* GnuTLS 3.6.4 introduced automatic master key rotation */
622	if (gnutls_check_version_numeric(3, 6, 4))
623	sc->tickets = GNUTLS_ENABLED_TRUE;
624	else
625	sc->tickets = GNUTLS_ENABLED_FALSE;
626	}
627	if (sc->export_certificates_size < 0)
628	sc->export_certificates_size = 0;
629	if (sc->client_verify_mode == -1)
630	sc->client_verify_mode = GNUTLS_CERT_IGNORE;
631	if (sc->client_verify_method == mgs_cvm_unset)
632	sc->client_verify_method = mgs_cvm_cartel;
633
634	// TODO: None of the stuff below needs to be done if
635	// sc->enabled == GNUTLS_ENABLED_FALSE, we could just continue
636	// to the next host.
637
638	/* Load certificates and stuff (includes parsing priority) */
639	rv = mgs_load_files(pconf, ptemp, s);
640	if (rv != 0) {
641	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
642	"%s: Loading credentials failed!", __func__);
643	return HTTP_NOT_FOUND;
644	}
645
646	sc->ocsp_mutex = sc_base->ocsp_mutex;
647	/* init OCSP configuration unless explicitly disabled */
648	if (sc->enabled && sc->ocsp_staple != GNUTLS_ENABLED_FALSE)
649	{
650	const char *err = mgs_ocsp_configure_stapling(pconf, ptemp, s);
651	if (err != NULL)
652	{
653	/* If OCSP stapling is enabled only by default ignore
654	* error and disable stapling */
655	if (sc->ocsp_staple == GNUTLS_ENABLED_UNSET)
656	{
657	ap_log_error(APLOG_MARK, APLOG_INFO, APR_SUCCESS, s,
658	"Cannnot enable OCSP stapling for "
659	"host '%s:%d': %s",
660	s->server_hostname, s->addrs->host_port, err);
661	sc->ocsp_staple = GNUTLS_ENABLED_FALSE;
662	}
663	/* If OCSP stapling is explicitly enabled this is a
664	* critical error. */
665	else
666	{
667	ap_log_error(APLOG_MARK, APLOG_STARTUP, APR_EINVAL, s,
668	"OCSP stapling configuration failed for "
669	"host '%s:%d': %s",
670	s->server_hostname, s->addrs->host_port, err);
671	return HTTP_INTERNAL_SERVER_ERROR;
672	}
673	}
674	else
675	{
676	/* Might already be set */
677	sc->ocsp_staple = GNUTLS_ENABLED_TRUE;
678	/* Set up stapling */
679	rv = mgs_ocsp_enable_stapling(pconf, ptemp, s);
680	if (rv != OK && rv != DECLINED)
681	return rv;
682	}
683	}
684
685	/* Check if the priorities have been set */
686	if (sc->priorities == NULL && sc->enabled == GNUTLS_ENABLED_TRUE) {
687	ap_log_error(APLOG_MARK, APLOG_INFO, 0, s,
688	"No GnuTLSPriorities directive for host '%s:%d', "
689	"using default '%s'.",
690	s->server_hostname, s->addrs->host_port,
691	MGS_DEFAULT_PRIORITY);
692	sc->priorities = default_prio;
693	}
694
695	/* Set host DH params from user configuration or defaults */
696	if (sc->dh_params != NULL) {
697	gnutls_certificate_set_dh_params(sc->certs, sc->dh_params);
698	gnutls_anon_set_server_dh_params(sc->anon_creds, sc->dh_params);
699	} else {
700	rv = set_default_dh_param(s);
701	if (rv != OK)
702	return rv;
703	}
704
705	/* The call after this comment is a workaround for bug in
706	* gnutls_certificate_set_retrieve_function2 that ignores
707	* supported certificate types. Should be fixed in GnuTLS
708	* 3.3.12.
709	*
710	* Details:
711	* https://lists.gnupg.org/pipermail/gnutls-devel/2015-January/007377.html
712	* Workaround from:
713	* https://github.com/vanrein/tlspool/commit/4938102d3d1b086491d147e6c8e4e2a02825fc12 */
714	#if GNUTLS_VERSION_NUMBER < 0x030312
715	gnutls_certificate_set_retrieve_function(sc->certs, (void *) exit);
716	#endif
717
718	gnutls_certificate_set_retrieve_function2(sc->certs, cert_retrieve_fn);
719
720	if ((sc->certs_x509_chain == NULL \|\| sc->certs_x509_chain_num < 1) &&
721	sc->enabled == GNUTLS_ENABLED_TRUE) {
722	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
723	"GnuTLS: Host '%s:%d' is missing a Certificate File!",
724	s->server_hostname, s->addrs->host_port);
725	return HTTP_UNAUTHORIZED;
726	}
727	if (sc->enabled == GNUTLS_ENABLED_TRUE &&
728	(sc->certs_x509_chain_num > 0 && sc->privkey_x509 == NULL))
729	{
730	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
731	"GnuTLS: Host '%s:%d' is missing a Private Key File!",
732	s->server_hostname, s->addrs->host_port);
733	return HTTP_UNAUTHORIZED;
734	}
735
736	if (sc->enabled == GNUTLS_ENABLED_TRUE
737	&& sc->proxy_enabled == GNUTLS_ENABLED_TRUE
738	&& load_proxy_x509_credentials(pconf, ptemp, s) != APR_SUCCESS)
739	{
740	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
741	"%s: loading proxy credentials for host "
742	"'%s:%d' failed, exiting!",
743	__func__, s->server_hostname, s->addrs->host_port);
744	return HTTP_PROXY_AUTHENTICATION_REQUIRED;
745	}
746	}
747
748
749	ap_add_version_component(pconf, "mod_gnutls/" MOD_GNUTLS_VERSION);
750
751	{
752	const char* libvers = gnutls_check_version(NULL);
753	char* gnutls_version = NULL;
754	if(libvers && (gnutls_version = apr_psprintf(pconf, "GnuTLS/%s", libvers))) {
755	ap_add_version_component(pconf, gnutls_version);
756	} else {
757	// In case we could not create the above string go for the static version instead
758	ap_add_version_component(pconf, "GnuTLS/" GNUTLS_VERSION "-static");
759	}
760	}
761
762	return OK;
763	}
764
765	void mgs_hook_child_init(apr_pool_t p, server_rec s)
766	{
767	apr_status_t rv = APR_SUCCESS;
768	mgs_srvconf_rec sc = (mgs_srvconf_rec )
769	ap_get_module_config(s->module_config, &gnutls_module);
770
771	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
772
773	/* if we use PKCS #11 reinitialize it */
774	if (mgs_pkcs11_reinit(s) < 0) {
775	ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s,
776	"GnuTLS: Failed to reinitialize PKCS #11");
777	exit(-1);
778	}
779
780	if (sc->cache_enable == GNUTLS_ENABLED_TRUE)
781	{
782	rv = mgs_cache_child_init(p, s, sc->cache, MGS_CACHE_MUTEX_NAME);
783	if (rv != APR_SUCCESS)
784	ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
785	"Child init for session cache failed!");
786	}
787
788	if (sc->ocsp_cache != NULL)
789	{
790	rv = mgs_cache_child_init(p, s, sc->ocsp_cache,
791	MGS_OCSP_CACHE_MUTEX_NAME);
792	if (rv != APR_SUCCESS)
793	ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
794	"Child init for OCSP cache failed!");
795	}
796
797	/* reinit OCSP request mutex */
798	const char *lockfile = apr_global_mutex_lockfile(sc->ocsp_mutex);
799	rv = apr_global_mutex_child_init(&sc->ocsp_mutex, lockfile, p);
800	if (rv != APR_SUCCESS)
801	ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
802	"Failed to reinit mutex '" MGS_OCSP_MUTEX_NAME "'.");
803
804	/* Block SIGPIPE Signals */
805	rv = apr_signal_block(SIGPIPE);
806	if(rv != APR_SUCCESS) {
807	/* error sending output */
808	ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
809	"GnuTLS: Error Blocking SIGPIPE Signal!");
810	}
811	}
812
813	const char mgs_hook_http_scheme(const request_rec r) {
814	mgs_srvconf_rec *sc;
815
816	if (r == NULL)
817	return NULL;
818
819	sc = (mgs_srvconf_rec *) ap_get_module_config(r->
820	server->module_config,
821	&gnutls_module);
822
823	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
824	if (sc->enabled == GNUTLS_ENABLED_FALSE) {
825	return NULL;
826	}
827
828	return "https";
829	}
830
831	apr_port_t mgs_hook_default_port(const request_rec * r) {
832	mgs_srvconf_rec *sc;
833
834	if (r == NULL)
835	return 0;
836
837	sc = (mgs_srvconf_rec *) ap_get_module_config(r->
838	server->module_config,
839	&gnutls_module);
840
841	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
842	if (sc->enabled == GNUTLS_ENABLED_FALSE) {
843	return 0;
844	}
845
846	return 443;
847	}
848
849	/**
850	* Default buffer size for SNI data, including the terminating NULL
851	* byte. The size matches what gnutls-cli uses initially.
852	*/
853	#define DEFAULT_SNI_HOST_LEN 256
854
855	typedef struct {
856	mgs_handle_t *ctxt;
857	mgs_srvconf_rec *sc;
858	const char *sni_name;
859	} vhost_cb_rec;
860
861	/**
862	* Matches the current vhost's ServerAlias directives
863	*
864	* @param x vhost callback record
865	* @param s server record
866	* @param tsc mod_gnutls server data for `s`
867	*
868	* @return true if a match, false otherwise
869	*
870	*/
871	int check_server_aliases(vhost_cb_rec x, server_rec s, mgs_srvconf_rec *tsc)
872	{
873	apr_array_header_t *names;
874	int rv = 0;
875	char ** name;
876
877	/* Check ServerName First! */
878	if(apr_strnatcasecmp(x->sni_name, s->server_hostname) == 0) {
879	// We have a match, save this server configuration
880	x->sc = tsc;
881	rv = 1;
882	/* Check any ServerAlias directives */
883	} else if(s->names->nelts) {
884	names = s->names;
885	name = (char **)names->elts;
886	for (int i = 0; i < names->nelts; ++i)
887	{
888	if (!name[i]) { continue; }
889	if (apr_strnatcasecmp(x->sni_name, name[i]) == 0) {
890	// We have a match, save this server configuration
891	x->sc = tsc;
892	rv = 1;
893	}
894	}
895	/* Wild any ServerAlias Directives */
896	} else if(s->wild_names->nelts) {
897	names = s->wild_names;
898	name = (char **)names->elts;
899	for (int i = 0; i < names->nelts; ++i)
900	{
901	if (!name[i]) { continue; }
902	if(apr_fnmatch(name[i], x->sni_name ,
903	APR_FNM_CASE_BLIND\|
904	APR_FNM_PERIOD\|
905	APR_FNM_PATHNAME\|
906	APR_FNM_NOESCAPE) == APR_SUCCESS) {
907	x->sc = tsc;
908	rv = 1;
909	}
910	}
911	}
912	return rv;
913	}
914
915	static int vhost_cb(void baton, conn_rec conn, server_rec * s)
916	{
917	mgs_srvconf_rec *tsc;
918	vhost_cb_rec *x = baton;
919	int ret;
920
921	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
922	tsc = (mgs_srvconf_rec *) ap_get_module_config(s->module_config,
923	&gnutls_module);
924
925	if (tsc->enabled != GNUTLS_ENABLED_TRUE) {
926	return 0;
927	}
928
929	if (tsc->certs_x509_chain_num > 0) {
930	/* this check is there to warn administrator of any missing hostname
931	* in the certificate. */
932	ret = gnutls_x509_crt_check_hostname(tsc->certs_x509_crt_chain[0], s->server_hostname);
933	if (0 == ret)
934	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, conn,
935	"GnuTLS: the certificate doesn't match requested "
936	"hostname '%s'", s->server_hostname);
937	} else {
938	ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, conn,
939	"GnuTLS: SNI request for '%s' but no X.509 certs "
940	"available at all",
941	s->server_hostname);
942	}
943	return check_server_aliases(x, s, tsc);
944	}
945
946	/**
947	* Get SNI data from GnuTLS (if any) and search for a matching virtual
948	* host configuration. This method is called from the post client
949	* hello function.
950	*
951	* @param session the GnuTLS session
952	*
953	* @return either the matching mod_gnutls server config, or `NULL`
954	*/
955	mgs_srvconf_rec *mgs_find_sni_server(gnutls_session_t session)
956	{
957	mgs_handle_t *ctxt = gnutls_session_get_ptr(session);
958
959	char *sni_name = apr_palloc(ctxt->c->pool, DEFAULT_SNI_HOST_LEN);
960	size_t sni_len = DEFAULT_SNI_HOST_LEN;
961	unsigned int sni_type;
962
963	/* Search for a DNS SNI element. Note that RFC 6066 prohibits more
964	* than one server name per type. */
965	int sni_index = -1;
966	int rv = 0;
967	do {
968	/* The sni_index is incremented before each use, so if the
969	* loop terminates with a type match we will have the right
970	* one stored. */
971	rv = gnutls_server_name_get(session, sni_name,
972	&sni_len, &sni_type, ++sni_index);
973	if (rv == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
974	{
975	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_EGENERAL, ctxt->c,
976	"%s: no DNS SNI found (last index: %d).",
977	__func__, sni_index);
978	return NULL;
979	}
980	} while (sni_type != GNUTLS_NAME_DNS);
981	/* The (rv == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) path inside
982	* the loop above returns, so if we reach this point we have a DNS
983	* SNI at the current index. */
984
985	if (rv == GNUTLS_E_SHORT_MEMORY_BUFFER)
986	{
987	/* Allocate a new buffer of the right size and retry */
988	sni_name = apr_palloc(ctxt->c->pool, sni_len);
989	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
990	"%s: reallocated SNI data buffer for %" APR_SIZE_T_FMT
991	" bytes.", __func__, sni_len);
992	rv = gnutls_server_name_get(session, sni_name,
993	&sni_len, &sni_type, sni_index);
994	}
995
996	/* Unless there's a bug in the GnuTLS API only GNUTLS_E_IDNA_ERROR
997	* can occur here, but a catch all is safer and no more
998	* complicated. */
999	if (rv != GNUTLS_E_SUCCESS)
1000	{
1001	ap_log_cerror(APLOG_MARK, APLOG_INFO, APR_EGENERAL, ctxt->c,
1002	"%s: error while getting SNI DNS data: '%s' (%d).",
1003	__func__, gnutls_strerror(rv), rv);
1004	return NULL;
1005	}
1006
1007	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
1008	"%s: client requested server '%s'.",
1009	__func__, sni_name);
1010
1011	/* Search for vhosts matching connection parameters and the
1012	* SNI. If a match is found, cbx.sc will contain the mod_gnutls
1013	* server config for the vhost. */
1014	vhost_cb_rec cbx = {
1015	.ctxt = ctxt,
1016	.sc = NULL,
1017	.sni_name = sni_name
1018	};
1019	rv = ap_vhost_iterate_given_conn(ctxt->c, vhost_cb, &cbx);
1020	if (rv == 1) {
1021	return cbx.sc;
1022	}
1023	return NULL;
1024	}
1025
1026	/**
1027	* This function is intended as a cleanup handler for connections
1028	* using GnuTLS. If attached to the connection pool, it ensures that
1029	* session resources are released with the connection pool even if the
1030	* session wasn't terminated properly.
1031	*
1032	* @param data must point to the mgs_handle_t associated with the
1033	* connection
1034	*/
1035	static apr_status_t cleanup_gnutls_session(void *data)
1036	{
1037	/* nothing to do */
1038	if (data == NULL)
1039	return APR_SUCCESS;
1040
1041	/* check if session needs closing */
1042	mgs_handle_t ctxt = (mgs_handle_t ) data;
1043	if (ctxt->session != NULL)
1044	{
1045	ap_log_cerror(APLOG_MARK, APLOG_WARNING, APR_ECONNABORTED, ctxt->c,
1046	"%s: connection pool cleanup in progress but %sTLS "
1047	"session hasn't been terminated, trying to close",
1048	__func__, IS_PROXY_STR(ctxt));
1049	int ret;
1050	/* Try A Clean Shutdown */
1051	do
1052	ret = gnutls_bye(ctxt->session, GNUTLS_SHUT_WR);
1053	while (ret == GNUTLS_E_INTERRUPTED \|\| ret == GNUTLS_E_AGAIN);
1054	if (ret != GNUTLS_E_SUCCESS)
1055	ap_log_cerror(APLOG_MARK, APLOG_INFO, APR_EGENERAL, ctxt->c,
1056	"%s: error while closing TLS %sconnection: %s (%d)",
1057	__func__, IS_PROXY_STR(ctxt),
1058	gnutls_strerror(ret), ret);
1059	else
1060	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ctxt->c,
1061	"%s: TLS %sconnection closed.",
1062	__func__, IS_PROXY_STR(ctxt));
1063	/* De-Initialize Session */
1064	gnutls_deinit(ctxt->session);
1065	ctxt->session = NULL;
1066	}
1067	return APR_SUCCESS;
1068	}
1069
1070	static void create_gnutls_handle(conn_rec * c)
1071	{
1072	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1073
1074	/* Get connection specific configuration */
1075	mgs_handle_t *ctxt = init_gnutls_ctxt(c);
1076	ctxt->enabled = GNUTLS_ENABLED_TRUE;
1077	ctxt->status = 0;
1078	ctxt->input_rc = APR_SUCCESS;
1079	ctxt->input_bb = apr_brigade_create(c->pool, c->bucket_alloc);
1080	ctxt->input_cbuf.length = 0;
1081	ctxt->output_rc = APR_SUCCESS;
1082	ctxt->output_bb = apr_brigade_create(c->pool, c->bucket_alloc);
1083	ctxt->output_blen = 0;
1084	ctxt->output_length = 0;
1085
1086	/* Initialize GnuTLS Library */
1087	int err = 0;
1088	if (ctxt->is_proxy == GNUTLS_ENABLED_TRUE)
1089	{
1090	/* this is an outgoing proxy connection, client mode */
1091	err = gnutls_init(&ctxt->session, GNUTLS_CLIENT);
1092	if (err != GNUTLS_E_SUCCESS)
1093	ap_log_cerror(APLOG_MARK, APLOG_ERR, err, c,
1094	"gnutls_init for proxy connection failed: %s (%d)",
1095	gnutls_strerror(err), err);
1096	}
1097	else
1098	{
1099	/* incoming connection, server mode */
1100	err = gnutls_init(&ctxt->session, GNUTLS_SERVER);
1101	if (err != GNUTLS_E_SUCCESS)
1102	ap_log_cerror(APLOG_MARK, APLOG_ERR, err, c,
1103	"gnutls_init for server side failed: %s (%d)",
1104	gnutls_strerror(err), err);
1105	}
1106
1107	/* Ensure TLS session resources are released when the connection
1108	* pool is cleared, if the filters haven't done that already. */
1109	apr_pool_pre_cleanup_register(c->pool, ctxt, cleanup_gnutls_session);
1110
1111	/* Set Default Priority */
1112	err = gnutls_priority_set(ctxt->session, default_prio);
1113	if (err != GNUTLS_E_SUCCESS)
1114	ap_log_cerror(APLOG_MARK, APLOG_ERR, err, c,
1115	"gnutls_priority_set failed!");
1116	/* Set Handshake function */
1117	gnutls_handshake_set_post_client_hello_function(ctxt->session,
1118	mgs_select_virtual_server_cb);
1119
1120	/* Set GnuTLS user pointer, so we can access the module session
1121	* context in GnuTLS callbacks */
1122	gnutls_session_set_ptr(ctxt->session, ctxt);
1123
1124	/* If mod_gnutls is the TLS server, mgs_select_virtual_server_cb
1125	* will load appropriate credentials during handshake. However,
1126	* when handling a proxy backend connection, mod_gnutls acts as
1127	* TLS client and credentials must be loaded here. */
1128	if (ctxt->is_proxy == GNUTLS_ENABLED_TRUE)
1129	{
1130	/* Set anonymous client credentials for proxy connections */
1131	gnutls_credentials_set(ctxt->session, GNUTLS_CRD_ANON,
1132	ctxt->sc->anon_client_creds);
1133	/* Set x509 credentials */
1134	gnutls_credentials_set(ctxt->session, GNUTLS_CRD_CERTIFICATE,
1135	ctxt->sc->proxy_x509_creds);
1136	/* Load priorities from the server configuration */
1137	err = gnutls_priority_set(ctxt->session, ctxt->sc->proxy_priorities);
1138	if (err != GNUTLS_E_SUCCESS)
1139	ap_log_cerror(APLOG_MARK, APLOG_ERR, err, c,
1140	"%s: setting priorities for proxy connection "
1141	"failed: %s (%d)",
1142	__func__, gnutls_strerror(err), err);
1143	}
1144
1145	prepare_alpn_proposals(ctxt);
1146
1147	/* Initialize Session Cache */
1148	mgs_cache_session_init(ctxt);
1149
1150	/* Set pull, push & ptr functions */
1151	gnutls_transport_set_pull_function(ctxt->session,
1152	mgs_transport_read);
1153	gnutls_transport_set_push_function(ctxt->session,
1154	mgs_transport_write);
1155	gnutls_transport_set_ptr(ctxt->session, ctxt);
1156	/* Add IO filters */
1157	ctxt->input_filter = ap_add_input_filter(GNUTLS_INPUT_FILTER_NAME,
1158	ctxt, NULL, c);
1159	ctxt->output_filter = ap_add_output_filter(GNUTLS_OUTPUT_FILTER_NAME,
1160	ctxt, NULL, c);
1161	}
1162
1163	int mgs_hook_pre_connection(conn_rec * c, void *csd __attribute__((unused)))
1164	{
1165	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1166
1167	if (c->master)
1168	{
1169	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, c,
1170	"%s declined secondary connection", __func__);
1171	return DECLINED;
1172	}
1173
1174	mgs_srvconf_rec sc = (mgs_srvconf_rec )
1175	ap_get_module_config(c->base_server->module_config, &gnutls_module);
1176	mgs_handle_t ctxt = (mgs_handle_t )
1177	ap_get_module_config(c->conn_config, &gnutls_module);
1178
1179	if ((sc && (!sc->enabled))
1180	\|\| (ctxt && ctxt->enabled == GNUTLS_ENABLED_FALSE))
1181	{
1182	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, "%s declined connection",
1183	__func__);
1184	return DECLINED;
1185	}
1186
1187	create_gnutls_handle(c);
1188	return OK;
1189	}
1190
1191
1192
1193	/**
1194	* process_connection hook: Do a zero byte read to trigger the
1195	* handshake. Doesn't change anything for traditional protocols that
1196	* just do reads, but HTTP/2 needs the TLS handshake and ALPN to
1197	* happen before its process_connection hook runs.
1198	*/
1199	int mgs_hook_process_connection(conn_rec* c)
1200	{
1201	mgs_handle_t ctxt = (mgs_handle_t )
1202	ap_get_module_config(c->conn_config, &gnutls_module);
1203
1204	if ((ctxt != NULL) && (ctxt->enabled == GNUTLS_ENABLED_TRUE))
1205	{
1206	/* This connection is supposed to use TLS. Give the filters a
1207	* kick with a zero byte read to trigger the handshake. */
1208	apr_bucket_brigade* temp =
1209	apr_brigade_create(c->pool, c->bucket_alloc);
1210	ap_get_brigade(c->input_filters, temp,
1211	AP_MODE_INIT, APR_BLOCK_READ, 0);
1212	apr_brigade_destroy(temp);
1213	}
1214	return DECLINED;
1215	}
1216
1217
1218
1219	int mgs_hook_fixups(request_rec * r) {
1220	unsigned char sbuf[GNUTLS_MAX_SESSION_ID];
1221	const char *tmp;
1222	size_t len;
1223	mgs_handle_t *ctxt;
1224	int rv = OK;
1225
1226	if (r == NULL)
1227	return DECLINED;
1228
1229	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1230	apr_table_t *env = r->subprocess_env;
1231
1232	ctxt = get_effective_gnutls_ctxt(r->connection);
1233
1234	if (!ctxt \|\| ctxt->enabled != GNUTLS_ENABLED_TRUE \|\| ctxt->session == NULL)
1235	{
1236	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "request declined in %s", __func__);
1237	return DECLINED;
1238	}
1239
1240	apr_table_setn(env, "HTTPS", "on");
1241
1242	apr_table_setn(env, "SSL_VERSION_LIBRARY",
1243	"GnuTLS/" LIBGNUTLS_VERSION);
1244	apr_table_setn(env, "SSL_VERSION_INTERFACE",
1245	"mod_gnutls/" MOD_GNUTLS_VERSION);
1246
1247	apr_table_setn(env, "SSL_PROTOCOL",
1248	gnutls_protocol_get_name(gnutls_protocol_get_version(ctxt->session)));
1249
1250	/* should have been called SSL_CIPHERSUITE instead */
1251	apr_table_setn(env, "SSL_CIPHER",
1252	gnutls_cipher_suite_get_name(gnutls_kx_get(ctxt->session),
1253	gnutls_cipher_get(ctxt->session),
1254	gnutls_mac_get(ctxt->session)));
1255
1256	#if GNUTLS_VERSION_NUMBER >= 0x030600
1257	/* Compression support has been removed since GnuTLS 3.6.0 */
1258	apr_table_setn(env, "SSL_COMPRESS_METHOD", "NULL");
1259	#else
1260	apr_table_setn(env, "SSL_COMPRESS_METHOD",
1261	gnutls_compression_get_name(gnutls_compression_get(ctxt->session)));
1262	#endif
1263
1264	#ifdef ENABLE_SRP
1265	if (ctxt->sc->srp_tpasswd_conf_file != NULL && ctxt->sc->srp_tpasswd_file != NULL) {
1266	tmp = gnutls_srp_server_get_username(ctxt->session);
1267	apr_table_setn(env, "SSL_SRP_USER", (tmp != NULL) ? tmp : "");
1268	} else {
1269	apr_table_unset(env, "SSL_SRP_USER");
1270	}
1271	#endif
1272
1273	if (apr_table_get(env, "SSL_CLIENT_VERIFY") == NULL)
1274	apr_table_setn(env, "SSL_CLIENT_VERIFY", "NONE");
1275
1276	unsigned int key_size = 8 * gnutls_cipher_get_key_size(gnutls_cipher_get(ctxt->session));
1277	tmp = apr_psprintf(r->pool, "%u", key_size);
1278
1279	apr_table_setn(env, "SSL_CIPHER_USEKEYSIZE", tmp);
1280
1281	apr_table_setn(env, "SSL_CIPHER_ALGKEYSIZE", tmp);
1282
1283	apr_table_setn(env, "SSL_CIPHER_EXPORT",
1284	(key_size <= 40) ? "true" : "false");
1285
1286	int dhsize = gnutls_dh_get_prime_bits(ctxt->session);
1287	if (dhsize > 0) {
1288	tmp = apr_psprintf(r->pool, "%d", dhsize);
1289	apr_table_setn(env, "SSL_DH_PRIME_BITS", tmp);
1290	}
1291
1292	len = sizeof (sbuf);
1293	gnutls_session_get_id(ctxt->session, sbuf, &len);
1294	apr_table_setn(env, "SSL_SESSION_ID",
1295	apr_pescape_hex(r->pool, sbuf, len, 0));
1296
1297	if (gnutls_certificate_type_get(ctxt->session) == GNUTLS_CRT_X509) {
1298	mgs_add_common_cert_vars(r, ctxt->sc->certs_x509_crt_chain[0], 0,
1299	ctxt->sc->export_certificates_size);
1300	}
1301
1302	return rv;
1303	}
1304
1305	int mgs_hook_authz(request_rec * r) {
1306	int rv;
1307	mgs_handle_t *ctxt;
1308	mgs_dirconf_rec *dc;
1309
1310	if (r == NULL)
1311	return DECLINED;
1312
1313	dc = ap_get_module_config(r->per_dir_config, &gnutls_module);
1314
1315	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1316	ctxt = get_effective_gnutls_ctxt(r->connection);
1317
1318	if (!ctxt \|\| ctxt->session == NULL) {
1319	return DECLINED;
1320	}
1321
1322	if (dc->client_verify_mode == GNUTLS_CERT_IGNORE) {
1323	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1324	"GnuTLS: Directory set to Ignore Client Certificate!");
1325	} else {
1326	if (ctxt->sc->client_verify_mode < dc->client_verify_mode) {
1327	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1328	"GnuTLS: Attempting to rehandshake with peer. %d %d",
1329	ctxt->sc->client_verify_mode,
1330	dc->client_verify_mode);
1331
1332	/* If we already have a client certificate, there's no point in
1333	* re-handshaking... */
1334	rv = mgs_cert_verify(r, ctxt);
1335	if (rv != DECLINED && rv != HTTP_FORBIDDEN)
1336	return rv;
1337
1338	gnutls_certificate_server_set_request
1339	(ctxt->session, dc->client_verify_mode);
1340
1341	if (mgs_rehandshake(ctxt) != 0) {
1342	return HTTP_FORBIDDEN;
1343	}
1344	} else if (ctxt->sc->client_verify_mode ==
1345	GNUTLS_CERT_IGNORE) {
1346	#if MOD_GNUTLS_DEBUG
1347	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1348	"GnuTLS: Peer is set to IGNORE");
1349	#endif
1350	return DECLINED;
1351	}
1352	rv = mgs_cert_verify(r, ctxt);
1353	if (rv != DECLINED
1354	&& (rv != HTTP_FORBIDDEN
1355	\|\| dc->client_verify_mode == GNUTLS_CERT_REQUIRE
1356	\|\| (dc->client_verify_mode == -1
1357	&& ctxt->sc->client_verify_mode == GNUTLS_CERT_REQUIRE)))
1358	{
1359	return rv;
1360	}
1361	}
1362
1363	return DECLINED;
1364	}
1365
1366	/* variables that are not sent by default:
1367	*
1368	* SSL_CLIENT_CERT string PEM-encoded client certificate
1369	* SSL_SERVER_CERT string PEM-encoded client certificate
1370	*/
1371
1372	/* @param side is either 0 for SERVER or 1 for CLIENT
1373	*
1374	* @param export_cert_size (int) maximum size for environment variable
1375	* to use for the PEM-encoded certificate (0 means do not export)
1376	*/
1377	#define MGS_SIDE(suffix) ((side==0) ? "SSL_SERVER" suffix : "SSL_CLIENT" suffix)
1378
1379	static void mgs_add_common_cert_vars(request_rec * r, gnutls_x509_crt_t cert, int side, size_t export_cert_size) {
1380	unsigned char sbuf[64]; /* buffer to hold serials */
1381	char buf[AP_IOBUFSIZE];
1382	const char *tmp;
1383	char *tmp2;
1384	size_t len;
1385	int ret;
1386
1387	if (r == NULL)
1388	return;
1389
1390	apr_table_t *env = r->subprocess_env;
1391
1392	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1393	if (export_cert_size > 0) {
1394	len = 0;
1395	ret = gnutls_x509_crt_export(cert, GNUTLS_X509_FMT_PEM, NULL, &len);
1396	if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER) {
1397	if (len >= export_cert_size) {
1398	apr_table_setn(env, MGS_SIDE("_CERT"), "GNUTLS_CERTIFICATE_SIZE_LIMIT_EXCEEDED");
1399	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1400	"GnuTLS: Failed to export too-large X.509 certificate to environment");
1401	} else {
1402	char* cert_buf = apr_palloc(r->pool, len + 1);
1403	if (cert_buf != NULL && gnutls_x509_crt_export(cert, GNUTLS_X509_FMT_PEM, cert_buf, &len) >= 0) {
1404	cert_buf[len] = 0;
1405	apr_table_setn(env, MGS_SIDE("_CERT"), cert_buf);
1406	} else {
1407	ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r,
1408	"GnuTLS: failed to export X.509 certificate");
1409	}
1410	}
1411	} else {
1412	ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r,
1413	"GnuTLS: dazed and confused about X.509 certificate size");
1414	}
1415	}
1416
1417	len = sizeof (buf);
1418	gnutls_x509_crt_get_dn(cert, buf, &len);
1419	apr_table_setn(env, MGS_SIDE("_S_DN"), apr_pstrmemdup(r->pool, buf, len));
1420
1421	len = sizeof (buf);
1422	gnutls_x509_crt_get_issuer_dn(cert, buf, &len);
1423	apr_table_setn(env, MGS_SIDE("_I_DN"), apr_pstrmemdup(r->pool, buf, len));
1424
1425	len = sizeof (sbuf);
1426	gnutls_x509_crt_get_serial(cert, sbuf, &len);
1427	apr_table_setn(env, MGS_SIDE("_M_SERIAL"),
1428	apr_pescape_hex(r->pool, sbuf, len, 0));
1429
1430	ret = gnutls_x509_crt_get_version(cert);
1431	if (ret > 0)
1432	apr_table_setn(env, MGS_SIDE("_M_VERSION"),
1433	apr_psprintf(r->pool, "%u", ret));
1434
1435	apr_table_setn(env, MGS_SIDE("_CERT_TYPE"), "X.509");
1436
1437	tmp =
1438	mgs_time2sz(gnutls_x509_crt_get_expiration_time
1439	(cert), buf, sizeof (buf));
1440	apr_table_setn(env, MGS_SIDE("_V_END"), apr_pstrdup(r->pool, tmp));
1441
1442	tmp =
1443	mgs_time2sz(gnutls_x509_crt_get_activation_time
1444	(cert), buf, sizeof (buf));
1445	apr_table_setn(env, MGS_SIDE("_V_START"), apr_pstrdup(r->pool, tmp));
1446
1447	ret = gnutls_x509_crt_get_signature_algorithm(cert);
1448	if (ret >= 0) {
1449	apr_table_setn(env, MGS_SIDE("_A_SIG"),
1450	gnutls_sign_algorithm_get_name(ret));
1451	}
1452
1453	ret = gnutls_x509_crt_get_pk_algorithm(cert, NULL);
1454	if (ret >= 0) {
1455	apr_table_setn(env, MGS_SIDE("_A_KEY"),
1456	gnutls_pk_algorithm_get_name(ret));
1457	}
1458
1459	/* export all the alternative names (DNS, RFC822 and URI) */
1460	for (int i = 0; !(ret < 0); i++)
1461	{
1462	const char san, sanlabel;
1463	len = 0;
1464	ret = gnutls_x509_crt_get_subject_alt_name(cert, i,
1465	NULL, &len,
1466	NULL);
1467
1468	if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER && len > 1) {
1469	tmp2 = apr_palloc(r->pool, len + 1);
1470
1471	ret =
1472	gnutls_x509_crt_get_subject_alt_name(cert, i,
1473	tmp2,
1474	&len,
1475	NULL);
1476	tmp2[len] = 0;
1477
1478	sanlabel = apr_psprintf(r->pool, "%s%u", MGS_SIDE("_S_AN"), i);
1479	if (ret == GNUTLS_SAN_DNSNAME) {
1480	san = apr_psprintf(r->pool, "DNSNAME:%s", tmp2);
1481	} else if (ret == GNUTLS_SAN_RFC822NAME) {
1482	san = apr_psprintf(r->pool, "RFC822NAME:%s", tmp2);
1483	} else if (ret == GNUTLS_SAN_URI) {
1484	san = apr_psprintf(r->pool, "URI:%s", tmp2);
1485	} else {
1486	san = "UNSUPPORTED";
1487	}
1488	apr_table_setn(env, sanlabel, san);
1489	}
1490	}
1491	}
1492
1493
1494
1495	/* TODO: Allow client sending a X.509 certificate chain */
1496	static int mgs_cert_verify(request_rec * r, mgs_handle_t * ctxt) {
1497	const gnutls_datum_t *cert_list;
1498	unsigned int cert_list_size;
1499	/* assume the certificate is invalid unless explicitly set
1500	* otherwise */
1501	unsigned int status = GNUTLS_CERT_INVALID;
1502	int rv = GNUTLS_E_NO_CERTIFICATE_FOUND, ret;
1503	unsigned int ch_size = 0;
1504
1505	// TODO: union no longer needed here after removing its "pgp" component.
1506	union {
1507	gnutls_x509_crt_t x509[MAX_CHAIN_SIZE];
1508	} cert;
1509	apr_time_t expiration_time, cur_time;
1510
1511	if (r == NULL \|\| ctxt == NULL \|\| ctxt->session == NULL)
1512	return HTTP_FORBIDDEN;
1513
1514	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1515	cert_list =
1516	gnutls_certificate_get_peers(ctxt->session, &cert_list_size);
1517
1518	if (cert_list == NULL \|\| cert_list_size == 0) {
1519	/* It is perfectly OK for a client not to send a certificate if on REQUEST mode
1520	*/
1521	if (ctxt->sc->client_verify_mode == GNUTLS_CERT_REQUEST)
1522	return OK;
1523
1524	/* no certificate provided by the client, but one was required. */
1525	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1526	"GnuTLS: Failed to Verify Peer: "
1527	"Client did not submit a certificate");
1528	return HTTP_FORBIDDEN;
1529	}
1530
1531	if (gnutls_certificate_type_get(ctxt->session) == GNUTLS_CRT_X509) {
1532	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1533	"GnuTLS: A Chain of %d certificate(s) was provided for validation",
1534	cert_list_size);
1535
1536	for (ch_size = 0; ch_size < cert_list_size; ch_size++) {
1537	gnutls_x509_crt_init(&cert.x509[ch_size]);
1538	rv = gnutls_x509_crt_import(cert.x509[ch_size],
1539	&cert_list[ch_size],
1540	GNUTLS_X509_FMT_DER);
1541	// When failure to import, leave the loop
1542	if (rv != GNUTLS_E_SUCCESS) {
1543	if (ch_size < 1) {
1544	ap_log_rerror(APLOG_MARK,
1545	APLOG_INFO, 0, r,
1546	"GnuTLS: Failed to Verify Peer: "
1547	"Failed to import peer certificates.");
1548	ret = HTTP_FORBIDDEN;
1549	goto exit;
1550	}
1551	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1552	"GnuTLS: Failed to import some peer certificates. Using %d certificates",
1553	ch_size);
1554	rv = GNUTLS_E_SUCCESS;
1555	break;
1556	}
1557	}
1558	} else
1559	return HTTP_FORBIDDEN;
1560
1561	if (rv < 0) {
1562	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1563	"GnuTLS: Failed to Verify Peer: "
1564	"Failed to import peer certificates.");
1565	ret = HTTP_FORBIDDEN;
1566	goto exit;
1567	}
1568
1569	if (gnutls_certificate_type_get(ctxt->session) == GNUTLS_CRT_X509) {
1570	apr_time_ansi_put(&expiration_time,
1571	gnutls_x509_crt_get_expiration_time
1572	(cert.x509[0]));
1573
1574	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1575	"GnuTLS: Verifying list of %d certificate(s) via method '%s'",
1576	ch_size, mgs_readable_cvm(ctxt->sc->client_verify_method));
1577	switch(ctxt->sc->client_verify_method) {
1578	case mgs_cvm_cartel:
1579	rv = gnutls_x509_crt_list_verify(cert.x509, ch_size,
1580	ctxt->sc->ca_list,
1581	ctxt->sc->ca_list_size,
1582	NULL, 0, 0, &status);
1583	break;
1584	#ifdef ENABLE_MSVA
1585	case mgs_cvm_msva:
1586	{
1587	struct msv_response* resp = NULL;
1588	struct msv_query q = { .context="https", .peertype="client", .pkctype="x509pem" };
1589	msv_ctxt_t ctx = msv_ctxt_init(NULL);
1590	char cert_pem_buf[10 * 1024];
1591	size_t len = sizeof (cert_pem_buf);
1592
1593	rv = 0;
1594	if (gnutls_x509_crt_export(cert.x509[0], GNUTLS_X509_FMT_PEM, cert_pem_buf, &len) >= 0) {
1595	/* FIXME : put together a name from the cert we received, instead of hard-coding this value: */
1596	q.peername = mgs_x509_construct_uid(r, cert.x509[0]);
1597	q.pkcdata = cert_pem_buf;
1598	rv = msv_query_agent(ctx, q, &resp);
1599	if (rv == LIBMSV_ERROR_SUCCESS) {
1600	status = 0;
1601	} else if (rv == LIBMSV_ERROR_INVALID) {
1602	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1603	"GnuTLS: Monkeysphere validation failed: (message: %s)", resp->message);
1604	status = GNUTLS_CERT_INVALID;
1605	} else {
1606	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1607	"GnuTLS: Error communicating with the Monkeysphere Validation Agent: (%d) %s", rv, msv_strerror(ctx, rv));
1608	status = GNUTLS_CERT_INVALID;
1609	rv = -1;
1610	}
1611	} else {
1612	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1613	"GnuTLS: Could not convert the client certificate to PEM format");
1614	status = GNUTLS_CERT_INVALID;
1615	rv = GNUTLS_E_ASN1_ELEMENT_NOT_FOUND;
1616	}
1617	msv_response_destroy(resp);
1618	msv_ctxt_destroy(ctx);
1619	}
1620	break;
1621	#endif
1622	default:
1623	/* If this block is reached, that indicates a
1624	* configuration error or bug in mod_gnutls (invalid value
1625	* of ctxt->sc->client_verify_method). */
1626	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1627	"GnuTLS: Failed to Verify X.509 Peer: method '%s' is not supported",
1628	mgs_readable_cvm(ctxt->sc->client_verify_method));
1629	rv = GNUTLS_E_UNIMPLEMENTED_FEATURE;
1630	}
1631
1632	} else {
1633	/* Unknown certificate type */
1634	rv = GNUTLS_E_UNIMPLEMENTED_FEATURE;
1635	}
1636
1637	/* "goto exit" at the end of this block skips evaluation of the
1638	* "status" variable */
1639	if (rv < 0) {
1640	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1641	"GnuTLS: Failed to Verify Peer certificate: (%d) %s",
1642	rv, gnutls_strerror(rv));
1643	if (rv == GNUTLS_E_NO_CERTIFICATE_FOUND)
1644	ap_log_rerror(APLOG_MARK, APLOG_EMERG, 0, r,
1645	"GnuTLS: No certificate was found for verification. Did you set the GnuTLSClientCAFile directive?");
1646	ret = HTTP_FORBIDDEN;
1647	goto exit;
1648	}
1649
1650	/* TODO: X509 CRL Verification. */
1651	/* May add later if anyone needs it.
1652	*/
1653	/* ret = gnutls_x509_crt_check_revocation(crt, crl_list, crl_list_size); */
1654
1655	cur_time = apr_time_now();
1656
1657	if (status & GNUTLS_CERT_SIGNER_NOT_FOUND) {
1658	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1659	"GnuTLS: Could not find Signer for Peer Certificate");
1660	}
1661
1662	if (status & GNUTLS_CERT_SIGNER_NOT_CA) {
1663	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1664	"GnuTLS: Peer's Certificate signer is not a CA");
1665	}
1666
1667	if (status & GNUTLS_CERT_INSECURE_ALGORITHM) {
1668	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1669	"GnuTLS: Peer's Certificate is using insecure algorithms");
1670	}
1671
1672	if (status & GNUTLS_CERT_EXPIRED
1673	\|\| status & GNUTLS_CERT_NOT_ACTIVATED) {
1674	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1675	"GnuTLS: Peer's Certificate signer is expired or not yet activated");
1676	}
1677
1678	if (status & GNUTLS_CERT_INVALID) {
1679	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1680	"GnuTLS: Peer Certificate is invalid.");
1681	} else if (status & GNUTLS_CERT_REVOKED) {
1682	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1683	"GnuTLS: Peer Certificate is revoked.");
1684	}
1685
1686	mgs_add_common_cert_vars(r, cert.x509[0], 1, ctxt->sc->export_certificates_size);
1687
1688	{
1689	/* days remaining */
1690	unsigned long remain =
1691	(apr_time_sec(expiration_time) -
1692	apr_time_sec(cur_time)) / 86400;
1693	apr_table_setn(r->subprocess_env, "SSL_CLIENT_V_REMAIN",
1694	apr_psprintf(r->pool, "%lu", remain));
1695	}
1696
1697	if (status == 0) {
1698	apr_table_setn(r->subprocess_env, "SSL_CLIENT_VERIFY",
1699	"SUCCESS");
1700	ret = OK;
1701	} else {
1702	apr_table_setn(r->subprocess_env, "SSL_CLIENT_VERIFY",
1703	"FAILED");
1704	if (ctxt->sc->client_verify_mode == GNUTLS_CERT_REQUEST)
1705	ret = OK;
1706	else
1707	ret = HTTP_FORBIDDEN;
1708	}
1709
1710	exit:
1711	if (gnutls_certificate_type_get(ctxt->session) == GNUTLS_CRT_X509)
1712	for (unsigned int i = 0; i < ch_size; i++)
1713	gnutls_x509_crt_deinit(cert.x509[i]);
1714
1715	return ret;
1716	}
1717
1718
1719
1720	#ifdef ENABLE_MSVA
1721	/* this section of code is used only when trying to talk to the MSVA */
1722	static const char* mgs_x509_leaf_oid_from_dn(apr_pool_t pool, const char oid, gnutls_x509_crt_t cert) {
1723	int rv=GNUTLS_E_SUCCESS, i;
1724	size_t sz=0, lastsz=0;
1725	char* data=NULL;
1726
1727	i = -1;
1728	while(rv != GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
1729	i++;
1730	lastsz=sz;
1731	sz=0;
1732	rv = gnutls_x509_crt_get_dn_by_oid (cert, oid, i, 0, NULL, &sz);
1733	}
1734	if (i > 0) {
1735	data = apr_palloc(pool, lastsz);
1736	sz=lastsz;
1737	rv = gnutls_x509_crt_get_dn_by_oid (cert, oid, i-1, 0, data, &sz);
1738	if (rv == GNUTLS_E_SUCCESS)
1739	return data;
1740	}
1741	return NULL;
1742	}
1743
1744	static const char* mgs_x509_first_type_from_san(apr_pool_t *pool, gnutls_x509_subject_alt_name_t target, gnutls_x509_crt_t cert) {
1745	int rv=GNUTLS_E_SUCCESS;
1746	size_t sz;
1747	char* data=NULL;
1748	unsigned int i;
1749	gnutls_x509_subject_alt_name_t thistype;
1750
1751	i = 0;
1752	while(rv != GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
1753	sz = 0;
1754	rv = gnutls_x509_crt_get_subject_alt_name2(cert, i, NULL, &sz, &thistype, NULL);
1755	if (rv == GNUTLS_E_SHORT_MEMORY_BUFFER && thistype == target) {
1756	data = apr_palloc(pool, sz);
1757	rv = gnutls_x509_crt_get_subject_alt_name2(cert, i, data, &sz, &thistype, NULL);
1758	if (rv >=0 && (thistype == target))
1759	return data;
1760	}
1761	i++;
1762	}
1763	return NULL;
1764	}
1765
1766
1767	/* Create a string representing a candidate User ID from an X.509
1768	* certificate
1769
1770	* We need this for client certification because a client gives us a
1771	* certificate, but doesn't tell us (in any other way) who they are
1772	* trying to authenticate as.
1773
1774	* one complaint might be "but the user wanted to be another identity,
1775	* which is also in the certificate (e.g. in a SubjectAltName)"
1776	* However, given that any user can regenerate their own X.509
1777	* certificate with their own public key content, they should just do
1778	* so, and not expect us to guess at their identity :)
1779
1780	* This function allocates it's response from the pool given it. When
1781	* that pool is reclaimed, the response will also be deallocated.
1782
1783	* FIXME: what about extracting a server-style cert
1784	* (e.g. https://imposter.example) from the DN or any sAN?
1785
1786	* FIXME: what if we want to call this outside the context of a
1787	* request? That complicates the logging.
1788	*/
1789	static const char* mgs_x509_construct_uid(request_rec *r, gnutls_x509_crt_t cert) {
1790	/* basic strategy, assuming humans are the users: we are going to
1791	* try to reconstruct a "conventional" User ID by pulling in a
1792	* name, comment, and e-mail address.
1793	*/
1794	apr_pool_t *pool = r->pool;
1795	const char name=NULL, comment=NULL, *email=NULL;
1796	const char *ret=NULL;
1797	/* subpool for temporary allocation: */
1798	apr_pool_t *sp=NULL;
1799
1800	if (APR_SUCCESS != apr_pool_create(&sp, pool))
1801	return NULL; /* i'm assuming that libapr would log this kind
1802	* of error on its own */
1803
1804	/* Name
1805
1806	the name comes from the leaf commonName of the cert's Subject.
1807
1808	(MAYBE: should we look at trying to assemble a candidate from
1809	givenName, surName, suffix, etc? the "name" field
1810	appears to be case-insensitive, which seems problematic
1811	from what we expect; see:
1812	http://www.itu.int/rec/T-REC-X.520-200102-s/e )
1813
1814	(MAYBE: should we try pulling a commonName or otherName or
1815	something from subjectAltName? see:
1816	https://tools.ietf.org/html/rfc5280#section-4.2.1.6
1817	GnuTLS does not support looking for Common Names in the
1818	SAN yet)
1819	*/
1820	name = mgs_x509_leaf_oid_from_dn(sp, GNUTLS_OID_X520_COMMON_NAME, cert);
1821
1822	/* Comment
1823
1824	I am inclined to punt on this for now, as Comment has been so
1825	atrociously misused in OpenPGP. Perhaps if there is a
1826	pseudonym (OID 2.5.4.65, aka GNUTLS_OID_X520_PSEUDONYM) field
1827	in the subject or sAN?
1828	*/
1829	comment = mgs_x509_leaf_oid_from_dn(sp, GNUTLS_OID_X520_PSEUDONYM, cert);
1830
1831	/* E-mail
1832
1833	This should be the the first rfc822Name from the sAN.
1834
1835	failing that, we'll take the leaf email in the certificate's
1836	subject; this is a deprecated use though.
1837	*/
1838	email = mgs_x509_first_type_from_san(sp, GNUTLS_SAN_RFC822NAME, cert);
1839	if (email == NULL)
1840	email = mgs_x509_leaf_oid_from_dn(sp, GNUTLS_OID_PKCS9_EMAIL, cert);
1841
1842	/* assemble all the parts: */
1843
1844	/* must have at least a name or an e-mail. */
1845	if (name == NULL && email == NULL) {
1846	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1847	"GnuTLS: Need either a name or an e-mail address to get a User ID from an X.509 certificate.");
1848	goto end;
1849	}
1850	if (name) {
1851	if (comment) {
1852	if (email) {
1853	ret = apr_psprintf(pool, "%s (%s) <%s>", name, comment, email);
1854	} else {
1855	ret = apr_psprintf(pool, "%s (%s)", name, comment);
1856	}
1857	} else {
1858	if (email) {
1859	ret = apr_psprintf(pool, "%s <%s>", name, email);
1860	} else {
1861	ret = apr_pstrdup(pool, name);
1862	}
1863	}
1864	} else {
1865	if (comment) {
1866	ret = apr_psprintf(pool, "(%s) <%s>", comment, email);
1867	} else {
1868	ret = apr_psprintf(pool, "<%s>", email);
1869	}
1870	}
1871
1872	end:
1873	apr_pool_destroy(sp);
1874	return ret;
1875	}
1876	#endif /* ENABLE_MSVA */
1877
1878
1879
1880	/*
1881	* This hook writes the mod_gnutls status message for a mod_status
1882	* report. According to the comments in mod_status.h, the "flags"
1883	* parameter is a bitwise OR of the AP_STATUS_ flags.
1884	*
1885	* Note that this implementation gives flags explicitly requesting a
1886	* simple response priority, e.g. if AP_STATUS_SHORT is set, flags
1887	* requesting an HTML report will be ignored. As of Apache 2.4.10, the
1888	* following flags were defined in mod_status.h:
1889	*
1890	* AP_STATUS_SHORT (short, non-HTML report requested)
1891	* AP_STATUS_NOTABLE (HTML report without tables)
1892	* AP_STATUS_EXTENDED (detailed report)
1893	*/
1894	static int mgs_status_hook(request_rec *r, int flags)
1895	{
1896	if (r == NULL)
1897	return OK;
1898
1899	mgs_srvconf_rec sc = (mgs_srvconf_rec )
1900	ap_get_module_config(r->server->module_config, &gnutls_module);
1901
1902	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1903
1904	if (flags & AP_STATUS_SHORT)
1905	{
1906	ap_rprintf(r, "Using GnuTLS version: %s\n", gnutls_check_version(NULL));
1907	ap_rputs("Built against GnuTLS version: " GNUTLS_VERSION "\n", r);
1908	}
1909	else
1910	{
1911	ap_rputs("<hr>\n", r);
1912	ap_rputs("<h2>GnuTLS Information:</h2>\n<dl>\n", r);
1913
1914	ap_rprintf(r, "<dt>Using GnuTLS version:</dt><dd>%s</dd>\n",
1915	gnutls_check_version(NULL));
1916	ap_rputs("<dt>Built against GnuTLS version:</dt><dd>"
1917	GNUTLS_VERSION "</dd>\n", r);
1918	ap_rprintf(r, "<dt>Using TLS:</dt><dd>%s</dd>\n",
1919	(sc->enabled == GNUTLS_ENABLED_FALSE ? "no" : "yes"));
1920	}
1921
1922	if (sc->enabled != GNUTLS_ENABLED_FALSE)
1923	{
1924	mgs_handle_t* ctxt = get_effective_gnutls_ctxt(r->connection);
1925	if (ctxt && ctxt->session != NULL)
1926	{
1927	char* s_info = gnutls_session_get_desc(ctxt->session);
1928	if (s_info)
1929	{
1930	if (flags & AP_STATUS_SHORT)
1931	ap_rprintf(r, "Current TLS session: %s\n", s_info);
1932	else
1933	ap_rprintf(r, "<dt>Current TLS session:</dt><dd>%s</dd>\n",
1934	s_info);
1935	gnutls_free(s_info);
1936	}
1937	}
1938	}
1939
1940	if (!(flags & AP_STATUS_SHORT))
1941	ap_rputs("</dl>\n", r);
1942
1943	return OK;
1944	}
1945
1946
1947
1948	/*
1949	* Callback to check the server certificate for proxy HTTPS
1950	* connections, to be used with
1951	* gnutls_certificate_set_verify_function.
1952
1953	* Returns: 0 if certificate check was successful (certificate
1954	* trusted), non-zero otherwise (error during check or untrusted
1955	* certificate).
1956	*/
1957	static int gtls_check_server_cert(gnutls_session_t session)
1958	{
1959	mgs_handle_t ctxt = (mgs_handle_t ) gnutls_session_get_ptr(session);
1960	unsigned int status;
1961
1962	/* Get peer hostname from a note left by mod_proxy */
1963	const char *peer_hostname =
1964	apr_table_get(ctxt->c->notes, PROXY_SNI_NOTE);
1965	if (peer_hostname == NULL)
1966	ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, ctxt->c,
1967	"%s: " PROXY_SNI_NOTE " NULL, cannot check "
1968	"peer's hostname", __func__);
1969
1970	/* Verify certificate, including hostname match. Should
1971	* peer_hostname be NULL for some reason, the name is not
1972	* checked. */
1973	int err = gnutls_certificate_verify_peers3(session, peer_hostname,
1974	&status);
1975	if (err != GNUTLS_E_SUCCESS)
1976	{
1977	ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, ctxt->c,
1978	"%s: server certificate check failed: %s (%d)",
1979	__func__, gnutls_strerror(err), err);
1980	return err;
1981	}
1982
1983	if (status == 0)
1984	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, ctxt->c,
1985	"%s: server certificate is trusted.",
1986	__func__);
1987	else
1988	{
1989	gnutls_datum_t out;
1990	/* GNUTLS_CRT_X509: ATM, only X509 is supported for proxy
1991	* certs 0: according to function API, the last argument
1992	* should be 0 */
1993	err = gnutls_certificate_verification_status_print(status,
1994	GNUTLS_CRT_X509,
1995	&out, 0);
1996	if (err != GNUTLS_E_SUCCESS)
1997	ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, ctxt->c,
1998	"%s: server verify print failed: %s (%d)",
1999	__func__, gnutls_strerror(err), err);
2000	else
2001	ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, ctxt->c,
2002	"%s: %s",
2003	__func__, out.data);
2004	gnutls_free(out.data);
2005	}
2006
2007	return status;
2008	}
2009
2010
2011
2012	static apr_status_t cleanup_proxy_x509_credentials(void *arg)
2013	{
2014	mgs_srvconf_rec sc = (mgs_srvconf_rec ) arg;
2015
2016	if (sc->proxy_x509_creds)
2017	{
2018	/* This implicitly releases the associated trust list
2019	* sc->proxy_x509_tl, too. */
2020	gnutls_certificate_free_credentials(sc->proxy_x509_creds);
2021	sc->proxy_x509_creds = NULL;
2022	sc->proxy_x509_tl = NULL;
2023	}
2024
2025	if (sc->anon_client_creds)
2026	{
2027	gnutls_anon_free_client_credentials(sc->anon_client_creds);
2028	sc->anon_client_creds = NULL;
2029	}
2030
2031	/* Deinit proxy priorities only if set from
2032	* sc->proxy_priorities_str. Otherwise the server is using the
2033	* default global priority cache, which must not be deinitialized
2034	* here. */
2035	if (sc->proxy_priorities_str && sc->proxy_priorities)
2036	{
2037	gnutls_priority_deinit(sc->proxy_priorities);
2038	sc->proxy_priorities = NULL;
2039	}
2040
2041	return APR_SUCCESS;
2042	}
2043
2044
2045
2046	static apr_status_t load_proxy_x509_credentials(apr_pool_t *pconf,
2047	apr_pool_t *ptemp,
2048	server_rec *s)
2049	{
2050	mgs_srvconf_rec sc = (mgs_srvconf_rec )
2051	ap_get_module_config(s->module_config, &gnutls_module);
2052
2053	if (sc == NULL)
2054	return APR_EGENERAL;
2055
2056	apr_status_t ret = APR_EINIT;
2057	int err = GNUTLS_E_SUCCESS;
2058
2059	/* Cleanup function for the GnuTLS structures allocated below */
2060	apr_pool_cleanup_register(pconf, sc, cleanup_proxy_x509_credentials,
2061	apr_pool_cleanup_null);
2062
2063	/* Function pool, gets destroyed before exit. */
2064	apr_pool_t *pool;
2065	ret = apr_pool_create(&pool, ptemp);
2066	if (ret != APR_SUCCESS)
2067	{
2068	ap_log_error(APLOG_MARK, APLOG_ERR, ret, s,
2069	"%s: failed to allocate function memory pool.", __func__);
2070	return ret;
2071	}
2072
2073	/* allocate credentials structures */
2074	err = gnutls_certificate_allocate_credentials(&sc->proxy_x509_creds);
2075	if (err != GNUTLS_E_SUCCESS)
2076	{
2077	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2078	"%s: Failed to initialize proxy credentials: (%d) %s",
2079	__func__, err, gnutls_strerror(err));
2080	return APR_EGENERAL;
2081	}
2082	err = gnutls_anon_allocate_client_credentials(&sc->anon_client_creds);
2083	if (err != GNUTLS_E_SUCCESS)
2084	{
2085	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2086	"%s: Failed to initialize anon credentials for proxy: "
2087	"(%d) %s", __func__, err, gnutls_strerror(err));
2088	return APR_EGENERAL;
2089	}
2090
2091	/* Check if the proxy priorities have been set, fail immediately
2092	* if not */
2093	if (sc->proxy_priorities_str == NULL)
2094	{
2095	ap_log_error(APLOG_MARK, APLOG_INFO, 0, s,
2096	"No GnuTLSProxyPriorities directive for host '%s:%d', "
2097	"using default '%s'.",
2098	s->server_hostname, s->addrs->host_port,
2099	MGS_DEFAULT_PRIORITY);
2100	sc->proxy_priorities = default_prio;
2101	}
2102	else
2103	{
2104	/* parse proxy priorities */
2105	const char *err_pos = NULL;
2106	err = gnutls_priority_init(&sc->proxy_priorities,
2107	sc->proxy_priorities_str, &err_pos);
2108	if (err != GNUTLS_E_SUCCESS)
2109	{
2110	if (ret == GNUTLS_E_INVALID_REQUEST)
2111	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2112	"%s: Syntax error parsing proxy priorities "
2113	"string at: %s",
2114	__func__, err_pos);
2115	else
2116	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2117	"Error setting proxy priorities: %s (%d)",
2118	gnutls_strerror(err), err);
2119	ret = APR_EGENERAL;
2120	}
2121	}
2122
2123	/* load certificate and key for client auth, if configured */
2124	if (sc->proxy_x509_key_file && sc->proxy_x509_cert_file)
2125	{
2126	char* cert_file = ap_server_root_relative(pool,
2127	sc->proxy_x509_cert_file);
2128	char* key_file = ap_server_root_relative(pool,
2129	sc->proxy_x509_key_file);
2130	err = gnutls_certificate_set_x509_key_file(sc->proxy_x509_creds,
2131	cert_file,
2132	key_file,
2133	GNUTLS_X509_FMT_PEM);
2134	if (err != GNUTLS_E_SUCCESS)
2135	{
2136	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2137	"%s: loading proxy client credentials failed: %s (%d)",
2138	__func__, gnutls_strerror(err), err);
2139	ret = APR_EGENERAL;
2140	}
2141	}
2142	else if (!sc->proxy_x509_key_file && sc->proxy_x509_cert_file)
2143	{
2144	ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
2145	"%s: proxy key file not set!", __func__);
2146	ret = APR_EGENERAL;
2147	}
2148	else if (!sc->proxy_x509_cert_file && sc->proxy_x509_key_file)
2149	{
2150	ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
2151	"%s: proxy certificate file not set!", __func__);
2152	ret = APR_EGENERAL;
2153	}
2154	else
2155	/* if both key and cert are NULL, client auth is not used */
2156	ap_log_error(APLOG_MARK, APLOG_INFO, 0, s,
2157	"%s: no client credentials for proxy", __func__);
2158
2159	/* must be set if the server certificate is to be checked */
2160	if (sc->proxy_x509_ca_file)
2161	{
2162	/* initialize the trust list */
2163	err = gnutls_x509_trust_list_init(&sc->proxy_x509_tl, 0);
2164	if (err != GNUTLS_E_SUCCESS)
2165	{
2166	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2167	"%s: gnutls_x509_trust_list_init failed: %s (%d)",
2168	__func__, gnutls_strerror(err), err);
2169	ret = APR_EGENERAL;
2170	}
2171
2172	char* ca_file = ap_server_root_relative(pool,
2173	sc->proxy_x509_ca_file);
2174	/* if no CRL is used, sc->proxy_x509_crl_file is NULL */
2175	char* crl_file = NULL;
2176	if (sc->proxy_x509_crl_file)
2177	crl_file = ap_server_root_relative(pool,
2178	sc->proxy_x509_crl_file);
2179
2180	/* returns number of loaded elements */
2181	err = gnutls_x509_trust_list_add_trust_file(sc->proxy_x509_tl,
2182	ca_file,
2183	crl_file,
2184	GNUTLS_X509_FMT_PEM,
2185	0 /* tl_flags */,
2186	0 /* tl_vflags */);
2187	if (err > 0)
2188	ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
2189	"%s: proxy CA trust list: %d structures loaded",
2190	__func__, err);
2191	else if (err == 0)
2192	ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
2193	"%s: proxy CA trust list is empty (%d)",
2194	__func__, err);
2195	else /* err < 0 */
2196	{
2197	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2198	"%s: error loading proxy CA trust list: %s (%d)",
2199	__func__, gnutls_strerror(err), err);
2200	ret = APR_EGENERAL;
2201	}
2202
2203	/* attach trust list to credentials */
2204	gnutls_certificate_set_trust_list(sc->proxy_x509_creds,
2205	sc->proxy_x509_tl, 0);
2206	}
2207	else
2208	ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
2209	"%s: no CA trust list for proxy connections, "
2210	"TLS connections will fail!", __func__);
2211
2212	gnutls_certificate_set_verify_function(sc->proxy_x509_creds,
2213	gtls_check_server_cert);
2214	apr_pool_destroy(pool);
2215	return ret;
2216	}

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